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παράλληλες και τέμνουσα.
Να μετακινήσετε το σημείο Μ και να παρατηρήσετε πως μεταβάλλονται οι γωνίες.Στο 2ο σχήμα δείτε τη σχέση των εντός εναλλάξ και των εντός εκτός και επί ταυτά γωνιών.